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Given that 
u=3w^(4)-5, find 
(d)/(dw)(4w^(2)-sin u) in terms of only 
w.
Answer:

Given that u=3w45 u=3 w^{4}-5 , find ddw(4w2sinu) \frac{d}{d w}\left(4 w^{2}-\sin u\right) in terms of only w w .\newlineAnswer:

Full solution

Q. Given that u=3w45 u=3 w^{4}-5 , find ddw(4w2sinu) \frac{d}{d w}\left(4 w^{2}-\sin u\right) in terms of only w w .\newlineAnswer:
  1. Identify Function and Rule: We need to find the derivative of the function 4w2sin(u)4w^2 - \sin(u) with respect to ww. To do this, we will use the chain rule, which states that the derivative of a composite function is the derivative of the outer function times the derivative of the inner function. In this case, the outer function is 4w2sin(x)4w^2 - \sin(x) and the inner function is u=3w45u = 3w^4 - 5.
  2. Differentiate Outer Function: First, we differentiate the outer function with respect to uu, treating ww as a constant. The derivative of 4w24w^2 with respect to uu is 00, since ww is treated as a constant and the derivative of sin(u)-\sin(u) with respect to uu is cos(u)-\cos(u).
  3. Differentiate Inner Function: Next, we differentiate the inner function u=3w45u = 3w^4 - 5 with respect to ww. The derivative of 3w43w^4 with respect to ww is 12w312w^3, and the derivative of 5-5 with respect to ww is 00. So, the derivative of uu with respect to ww is 12w312w^3.
  4. Apply Chain Rule: Now, we apply the chain rule by multiplying the derivative of the outer function with respect to uu by the derivative of the inner function with respect to ww. This gives us (0cos(u))×12w3(0 - \cos(u)) \times 12w^3.
  5. Simplify Expression: Simplify the expression by distributing the 12w312w^3 across the terms inside the parentheses. This results in 12w3cos(u)-12w^3 \cdot \cos(u).
  6. Express Derivative in Terms of ww: Finally, we need to express the derivative in terms of ww only. Since u=3w45u = 3w^4 - 5, we substitute uu back into the expression 12w3cos(u)-12w^3 \cdot \cos(u) to get 12w3cos(3w45)-12w^3 \cdot \cos(3w^4 - 5).

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